Pipe-wrench



c. E. REED.

PIPE WRENCH.

lLED ]ULY14.1920.

Patented Aug. 16, 1921.,

, aha/[61 Ki d CLARENCE E. REED, 0E HOUSTON, TEXAS.

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Application filed July 14,

To 'aZZ whom it may concern:

Be it known that I, CLARENCE E. Reno, a

citizen of the United States, and resident of Houston, Texas, have invented certain new and useful Improvements in Pipe- Wrenches, of which the following is a speoiployed for other kinds of work.

The invention is shown in the accompanying drawings, in which- Figure 1 is a longitudinal sectional view of the wrench with the drill stem in section and grasped thereby, the grips being locked in gripping position by the master wedge due to the construction of the finger lever E and its particular connection with the stem of the master wedge.

F ig. 2 is a sectional View substantially on the line 2--2 of Fig. 1 parts being in elevation.

Fig. 3 is a view of the finger lever in released position.

Fig. 4 is a view of a detail.

The wrench comprises two jaws F, l each oi which has a channeled face indicated at l, overhanging lips 2 being provided along the outer edge or the channel. These members F, F are pivotally mounted upon a bolt J held in place by a nut K. Within the channels of the jaws gripping members B are located, these being of substantially wedge shape but having points or edges 3 to grip the side of the pipe or other object designed to be manipulated by the wrench. These grips B are provided with pins H to prevent them from falling out of the channel l for which purpose the pins engage the lips 2. interposed between the grips B are wedge members C, these find a backing against the wall of the channel 1. A master wedge D is arranged centrally between the main jaws F F and this is capable of movement in a direction lr. ngitudinally between I the jaws F F. It is slotted at 4 to receive the bolt J and it has a stem D extending along the hollow handle G with its outer end pivotally connected at N to a lever E. .This lever E in the present invention is intended Specification of Letters Patent. Patented Aug, 16-, 1921,,

1920. Serial so. 396,070. Y

not only to force the master wedge forward;

so as to exert pressure against the gripsB and wedges C throughout the series-and force the grips into gripping contact wlth maintain the grips in the positions in which they are set to grip the pipe. This lever is cam shaped having a rounded surface at e a (lat surface at f and the handle of this lever extends substantially at a right angle from. this flat portion or from the general shape of the cam shaped head of the lever.

The main handle G of the wrench is pro-" vided with a ledge or transversely extending bearing surface g upon which the camshaped head of the lever works.

The inner end of the handle G. is of cam.

bear on the inner faces of the rear extenl shape, having a cam shape surface at ,5 to

sions 6 of the jaws F F at a point in rear of the pivot bolt 3. Thisliandle member is pivotally mounted on the divided pin L the two parts of which are mounted in the sides L of therear extension of jaw F. It will be noticed from Fig. 2 that the forward or cam shaped end of the lever or handle G- is divided or bifurcated so as to receive between its separated portions the shank of the master Wedge member D and consequently the pin L is divided into two parts as above stated. The bolt J connects the jaws F F and forms the pivot about which they turn.

Fig. 3 shows the finger lever E in released position, that is the stem D is drawn back and the master wedge is in retracted position and consequently the grips are loose and the wrench is in condition to be applied to the drill stem or pipe.

Then it is applied to the pipe, 2'. 6., so 1 that the pipe is embraced by the jaws of the wrench, the finger lever E is thrown from" the position of Fig. 3 to the position of Fig. l with the result that the cam shaped head of the finger lever working on the ledge 7- as a fulcrum will force'the stem forward with the master wedge and set the grips against the pipe.

A strong leverage is obtained and a strong fulcrum, a. a, to ledge g, resists the strain.

Further, it will be seen that the lever will be locked in position when turned to the relation shown in Fig. 1 because the pivot N is then so located in respect to the cam shaped end of the lever and particularly the.

a the pipe or other object, but also to lock the master wedge in its advanced position to final fulcrum point X that backward strain will set the lever harder in locked position with its straight surface 7 bearing againstseries of grips on the jaw, an opposing jaw,

a master wedge for setting the grips, a main handle provided with a bearing, a stem for the master wedge extending along the main handle and a finger lever carried by the main handle for operating the stem to set the master wedge, said finger lever being self locking and maintained in locked position by the back pressure from the master wedge, said finger lever having a cam shaped portion working on said bearing on the main handle and being pivotally connected to the stem, substantially as described.

2. In combination, in a wrench, a jaw, a series of grips on the jaw, an opposing jaw, a master wedge for setting the grips, a main handle provided with a bearing, a stem for the master wedge extending along the main handle, and a finger lever carried by the main handle for operating the stem to set the master wedge, said finger lever being so self locking and held in locked position"- by the back pressure from the master wedge,

said finger lever being pivoted to the stem and having a cam shaped head working on said hearing on the main handle, the high part of the cam being movable to a point out of line with the axis of the stem and the pivot to get the locking efiect of thefinger lever, substantially as described.

3. In combination, in a. pipe wrench, a

jaw carrying grips, an opposing jaw, a main ture.

CLARENCE E. REED. 

